کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1441380 1509403 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The influence of device physics on organic magnetoresistance
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
پیش نمایش صفحه اول مقاله
The influence of device physics on organic magnetoresistance
چکیده انگلیسی

In order to explain the surprisingly large, low field organic magnetoresistance (OMAR), several microscopic mechanisms have been proposed recently, but their effect on the polaron transport through a realistic device is relatively unknown. Here we study the effect of device physics on all proposed mechanisms, using a numerical drift-diffusion simulation method. We implement the local magnetic field dependent reactions via a magnetic field dependent recombination, mobility and triplet formation rate. Furthermore, a novel approach is used where we keep track of the subsequent particles formed from these reactions, including excitons and trions. We find that even in the most straightforward device structure sign changes can occur due to device physics. Especially the transition from a diffusion dominated to a drift dominated current near the built-in voltage plays a crucial role for understanding organic magnetoresistance. Finally, we conclude that the shape of the magnetocurrent as a function of voltage can be used as a fingerprint for the underlying dominant microscopic mechanism governing OMAR in a device.


► We study the effect of device physics on all organic magnetoresistance mechanisms.
► We used numerical drift-diffusion simulations methods to study organic semiconductors.
► We used a novel approach where we keep track of the particles formed from reactions.
► We observe sign changes that occur due to device physics.
► We conclude that the voltage dependence of OMAR is usable as a fingerprint.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Synthetic Metals - Volume 173, 1 June 2013, Pages 10–15
نویسندگان
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